DanielChem_CHI said:My vendor review relevant to certificates of analysis: ordered 4 times from my current compounder.
Reconstituted peptide stability data for certificates of analysis: I had Janoshik test my reconstituted vial at day 1, day 14, and day 28 stored in the refrigerator.
Day 1: 99.0% purity
Day 14: 98.6% purity
Day 28: 99.2% purity
Minimal degradation over 28 days when properly refrigerated. This confirms the standard 28-day beyond-use date is appropriate. Beyond 28 days, I'd reconstitute a fresh vial to be safe.
DanielChem_CHI said:My vendor review relevant to certificates of analysis: ordered 4 times from my current compounder.
Agreed, with the usual condition: that holds for the average and this board is a collection of individuals. A population claim and a personal prediction are different things and get quoted interchangeably.
DanielChem_CHI said:My vendor review relevant to certificates of analysis: ordered 4 times from my current compounder.
Saving this. It is the first explanation that did not require me to already understand it.
Sigma-Aldrich — Research-Grade Standards
Certified reference materials, analytical reagents, and research-grade standards for peptide verification. Trusted by laboratories worldwide.
Shop Reference StandardsClinical perspective, offered as context rather than as advice. Worth answering the question that was asked rather than the one behind it. The narrow version usually has an answer; the broad version usually does not, and answering the broad one is how a thread stops being useful.
hyun_seoul said:Worth answering the question that was asked rather than the one behind it.
Mine went the same way, slower. The detail I would add is minor and it is already implied above.